题目内容

脱式计算.(能简算的要简算.)
(12-13 )÷13+16 19÷(34+56 ) 551114÷11
0.6×1825+60%×625+35×125 (13+18-16 )×24 5×(215+120 )-512.
分析:(1)先算减法,再算除法,最后算加法;
(2)先算加法,再算除法;
(3)把5511114=551111+3,然后再根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)先算加法,再算减法,最后算乘法;
(6)先算加法,再算乘法,最后算减法.
解答:解:
(1)(12-13)÷13+16,
=(-1)÷13+16,
=-
1
13
+16,
=15
12
13


(2)19÷(34+56),
=19÷90,
=
19
90


(3)551114÷11,
=(551111+3)÷11,
=(551111+3)×
1
11

=551111×
1
11
+3×
1
11

=50101+
3
11

=50101
3
11


(4)0.6×1825+60%×625+35×125,
=0.6×1825+0.6×625+35×125,
=0.6×(1825+625)+35×125,
=0.6×2450+4375,
=1470+4375,
=5845;


(5)(13+18-16)×24,
=(31-16)×24,
=15×24,
=360;

(6)5×(215+120)-512,
=5×335-512,
=1675-512,
=1163.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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